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<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
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<body>
    <script>
        let age = prompt('请问您现在多少岁了')
        let a =5
        b = a + +age
        console.log(`据我估计，五年后，你可能${b}岁了`);
    </script>
</body>
</html>